As the directions describe, put the mounting bracket on the same stud that the wiper fluid tank is on, then take the provided nut and tighten down on the tank and stud. Problem is the tank is held on loosely with a rubber grommet. Tighting down on the rubber grommet basically destroys the grommet and never provides a tight fit for the mounting bracket. Had to remove the OEM grommet from the tank and improvise with some plastic washers to secure everything tightly.